buzzdecafe

const NIL = Symbol('~~NIL~~');
const isNil = x => typeof x === 'symbol' &&  x.toString() === NIL.toString();

const pair = (a, b) => ({
  fst: function* () { yield a; },
  snd: function* () { yield b; },
  [Symbol.iterator]: function* () { yield a; (b[Symbol.iterator] ? yield* b : yield b); }
});

buzzdecafe

const Loop = (fn, ... init) => { 
  let r = fn (... init)
  while (r instanceof Recur) r = fn (... r)
  return r
}

const Recur = ( ...v) => Object .create (
  Recur .prototype, 
  {[Symbol .iterator]: {value: _ => v .values ()}}
)

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# recurly does not document using cURL to access their API, they really want you to use their libraries.
# Sometimes i need to test something quick. I do not want to write a script importing your stupid library.
# So here's how you do it:

APIKEY=<get your API key from your recurly.com site>

curl -H "Accept: application/vnd.recurly.v2021-02-25+json" -u $APIKEY: https://v3.recurly.com/accounts